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A143883
as a simple table
n
a(n)
0
1
1
2
2
7
3
29
4
160
5
1135
6
10529
7
125770
8
1963039
9
39868375
10
1061669314
11
37110747097
12
1708827058427
[1,2,7,29,160,1135,10529,125770,1963039,39868375, 1061669314,37110747097,1708827058427]